Drinking Water: Definition & Technical Guide
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Drinking water, also called potable water, is water that has been treated or naturally occurs at a quality level safe for human consumption, food preparation, and personal hygiene without risk of short-term or long-term health effects. Drinking water in the United States must meet the maximum contaminant levels (MCLs) established by the Environmental Protection Agency under the Safe Drinking Water Act, which regulates over 90 chemical, biological, and radiological contaminants in public water systems.
Microorganisms, Inorganic Chemicals & Disinfection Byproduct Regulations
Drinking water quality is determined by the absence or controlled presence of contaminants that could cause illness. The EPA divides regulated contaminants into categories: microorganisms (bacteria, viruses, parasites), disinfection byproducts (trihalomethanes, haloacetic acids), inorganic chemicals (lead, copper, arsenic, nitrates), organic chemicals (benzene, pesticides, solvents), and radionuclides (radium, uranium).
Municipal drinking water originates from surface reservoirs, aquifers, or well fields and is treated at regional water plants. Treatment typically includes coagulation, filtration, and chlorine or chloramine disinfection. The finished water meets all EPA standards, but its quality can change as it travels through miles of distribution mains and the building’s internal plumbing before reaching the tap.
The “last mile” of drinking water delivery, from the water meter through the building’s supply piping to the faucet, is the homeowner’s responsibility. Aging galvanized steel pipes, lead solder joints in pre-1986 copper systems, and biofilm buildup in low-flow fixtures can all degrade water quality between the meter and the glass. This is why point-of-use treatment is common even in areas with excellent municipal water quality.
Municipal, Private Well, Bottled & Point-of-Use Treated Water Types
Municipally treated drinking water is the primary supply for most urban and suburban residents. It undergoes centralized treatment and continuous monitoring, with annual Consumer Confidence Reports published by each utility.
Private well drinking water is not regulated by the EPA and is the homeowner’s responsibility to test and treat. state health department recommends annual testing for bacteria, nitrates, and pH.
Bottled drinking water is regulated by the FDA under different standards than tap water. It may be sourced from municipal supplies, springs, or wells and undergoes various treatment processes.
Point-of-use treated water has been additionally purified at the faucet using reverse osmosis, activated carbon, or UV disinfection to reduce specific contaminants below municipal treatment levels.
Filtration, Repiping & Backflow Prevention for Water Quality Services
The plumbing system is the final delivery infrastructure for drinking water, and its condition directly affects water safety and quality. Bonded Plumbworks provides water treatment and filtration services that include whole-house filtration, reverse osmosis installation, and water softening to ensure drinking water quality at every fixture.
For properties with aging supply piping that may compromise water quality, Bonded Plumbworks’ pipe repair and repiping services replace galvanized steel, polybutylene, or lead-soldered copper lines with modern materials that do not leach contaminants. A professional water test before and after treatment system installation verifies that the selected solution addresses the identified contaminants.
Bonded Plumbworks’ backflow prevention services protect drinking water from contamination through cross-connections, ensuring that non-potable water from irrigation systems, pools, or chemical feeds cannot enter the potable supply.
EPA SDWA, NSF/ANSI 61, NSF/ANSI 53 & Lead and Copper Rule
The EPA Safe Drinking Water Act (SDWA) sets legally enforceable MCLs for public water systems. The state environmental agencies administer drinking water programs under applicable regulations.C. NSF/ANSI 61 certifies materials and products that contact drinking water. NSF/ANSI 53 certifies treatment devices for health-effects contaminant reduction. The Lead and Copper Rule requires action when lead exceeds 15 ppb or copper exceeds 1.3 ppm at customer taps.
APEC, Pentair, Culligan & Berkey Water Treatment Systems
APEC Water Systems produces five-stage reverse osmosis systems certified to NSF/ANSI 58. Pentair manufactures whole-house and under-sink drinking water filtration certified to NSF/ANSI 42 and 53. Culligan provides custom drinking water solutions based on local water analysis. Berkey produces gravity-fed drinking water purifiers for point-of-use applications.